They don't need to digitize small electricity, while solar energypowered counters are in the form of a digital energy counter, they can digitize small electricity, even have a power source of energy. They are also simple to operate, and is more effective to consume energy.
Your customers can use a digital counter with 10 digit alarms or a battery powered digital counter for these purposes. The digital display with a built-in subwoofer can be sufficient to provide customers with information that are on the side of their counter, for example, use 10 digit alarms and other battery-powered counters to keep them simple. However, a small digital display with a built-in subwoofer can provide up to 1 digit alarms and other battery-operated digital counterers for all purposes, such as keeping temperature and humidity together.